Rb26/30

[chairman]

cp flat tops im using

[G37Sam]

CP Flat Top here too on an RB26 head, it's around 8.2:1 if my math is right. It's not bad off boost.

[chairman]

so your motor is 8.2 ?

[KiwiRS4T]

Spool sell CP pistons for RB30/25 or26 in 8.2 or 9.0:1 compression - you want the 9.0:1

Just look through the RB30 Hybrid Upgrade thread. the last one is mine -only 312 AWKW with a stock (low compression) bottom end c/w this example from Proengines 364KW -similar build to mine but with cams and 9:1 pistons:

• RB30 bottom end
• Spool Rods
• Wiseco pistons 9:1
• ACL race series bearings
• crank collar, RB25 pump
• Cometic 1.3mm gasket
• head ported, std valves
• vvt removed, Tomei 256 intake cam, HKS 264 exhaust cam
• fabricated exh manifold, GT35/40 .7 front, .82 rear
• front facing plenum, std TB

Engine is on boost by 3000, very driveable.

[Shoota_77]

I got mine custom made (CP's) at 9.5:1. Only took a few extra weeks from the states,

[chairman]

your running at 9.5 ? how is it off boost , how much boost on pump unleaded

[Shoota_77]

I'll tell you as soon as it's built. Just in the process of building it now.

[chairman]

same as me bottom end is done

[chairman]

http://www.skylinesaustralia.com/forums/topic/423779-rb-2630-build/